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Vulnerabilities CVE-2026-39924

CVE-2026-39924

High
Open
TLP:CLEAR

Flarum < 1.8.16 Session Persistence via Improper Access Token Revocation

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Description

Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions.

Details

CVSS Score
7.6
EPSS Score
0.22%

13.2th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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